Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 70mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. Its short compact envelope saves about 50% of the mounting length of an ISO 15552 profile cylinder.
- BoreØ20 mm
- Stroke70 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B
A double acting compact cylinder built to ISO 21287, the ACEJ20X70-50B pairs a 20 mm bore with a 70 mm stroke and an external stop screw that trims the extend stroke anywhere within a 50 mm window, giving a usable range of 20-70 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those rise to 219.9 N and 164.9 N. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit.
For sizing the real workload, plan on roughly 94 N of usable push at 0.5 MPa rather than the full rating, which corresponds to lifting about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod with a male thread (the B code), fixed TPU bumpers absorb end-of-stroke energy at both ends, and speed spans 30-500 mm/s. No magnet is fitted on this version; the optional -S code adds one for CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 70 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M6×1.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Fixed TPU bumper (both ends) |
| Max standard stroke | Up to 100 mm |
Specifications follow the official AirTAC ACE-series (ISO 21287) datasheet. Body: hard-anodized aluminium alloy; piston rod: S45C carbon steel with hard-chrome plating. Rod type: female thread (blank) or male thread (B). Thread options: PT (blank) / G. A built-in magnet is OPTIONAL — add the -S code to fit CMSE / DMSE position sensors.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | 165 N |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -50 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| S | Optional built-in magnet for CMSE / DMSE sensors (omit for no magnet). |
| B | Rod type: B = male thread; blank = female thread. |
ACE-family variants: ACE (double acting), ASE / ATE (single acting push / pull), ACED (double rod), ACEJ (adjustable stroke), TACE / TACED (non-rotating twin-guide yoke). Mounting accessories: FA / FB flange, LB foot, CA / CB clevis, CR, SDB pivot, FTC; plus I and Y knuckles. Thread PT (blank) / G.
Where the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B Is Used
Bench-top press fixture
The 157.1 N push at 0.5 MPa clinches terminals or rivets in small electronics assemblies, and the 20-70 mm adjustable range lets one cylinder serve several part heights.
Compact pick-and-place gantry
With about 50% of the mounting length of an ISO 15552 profile cylinder, the short body fits between gantry rails, lifting parts of roughly 8 kg vertically with margin.
Packaging machine reject gate
The stop screw trims the extend stroke in seconds when the carton size changes, and the male threaded rod (B code) couples directly to standard gate linkages.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B the Right Cylinder?
At 157.1 N push at 0.5 MPa this bore sits between the 16 mm (100.5 N) and 25 mm (245.4 N) sizes: step down to 16 mm for lighter clamping, up to 25 mm when the load needs more margin. Remember the stop screw is a mechanical end stop only - on air loss the piston drifts, so it is not a mid-stroke lock or load-holding brake. FA flange or LB foot mounts bolt to the ISO 21287 face, and PT ports take standard fittings. If position feedback matters, order the -S variant instead, since this model has no magnet.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Short stroke fits the compact body
- ✓ Port/thread type (PT / G)
- ✓ Add -S if you need the magnet for sensors
- ✓ Rod type (female / male B) & mount (FA/LB/CA)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Compact body: keep the stroke short and avoid side load on the rod.
- check Do not dismantle the threaded front/back covers.
- check Keep speed within the rated range; the TPU bumper absorbs stroke-end energy.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, and the air supply must be filtered to 40 um. The port is M5x0.8 and the rod is 10 mm with a male thread.
The -50 code is a 50 mm adjustment window: an external stop screw shortens the 70 mm extend stroke by up to 50 mm, so you can set any usable stroke from 20 to 70 mm without disassembly. It is a mechanical end stop, not a mid-stroke lock. The body is hard-anodized aluminium to ISO 21287 with fixed TPU bumpers at both ends, FA/LB mounting options, and CMSE / DMSE switches can be used only if you order the optional -S magnet version - this model has no magnet fitted.
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